11
Power supply
module
The power supply module is located behind the
system front panel of the relay together with
the output relay module. The supply module is
a separate relay module and can be withdrawn
after removal of the system front panel. The
power supply module produces the voltages re-
quired by the relay modules from the auxiliary
supply voltage.
There are two types of power supply modules,
differing only in input voltage:
SPGU 240 A1:
Nominal voltage U
n
= 110/120/230/240 V ac
U
n
= 110/125/220 V dc
Operative range U = 80...265 V ac/dc
SPGU 48 B2:
Nominal voltage U
n
= 24/48/60 V dc
Operative range U = 18...80 V dc
The power supply type is marked on the system
front panel.
The power supply module is a transformer con-
nected, i.e. galvanically separated primary and
secondary circuits, flyback type rectifier. The
primary circuit is protected by a fuse F1, 1A
(slow) in SPGU 240 A1 and 4A (fast) in SPGU
48 B2, which are located on the printed circuit
board of the module.
When the power supply is on, a green LED in-
dicator U
aux
is lit on the system panel. The su-
pervision of the supply voltages for the electron-
ics is located on the regulating modules. The
self-supervision alarm is given if any of the sec-
ondary voltages differ more than 25% from the
nominal value. Also, if the power supply mod-
ule is missing, or if there is no auxiliary supply
to the voltage regulator at all, an alarm is given.
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